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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e83de3ef746fff16f0f2f5dc2f97ffe3f6b3fc8d4bc7bad6c4643c9fc360be9' 
  AND token = 'Pa36Tkj0iQsb5QZzO3gY21fSu/4SY9uxZKNX9iyuWu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}