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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e734cf2779e6a8ab561289dd9f6200793bc48a52ece4c06a77651827e032a91a' 
  AND token = 'OiN6gXRfXVCOy6I3sG6t57p7r2PDAY7xXujeyTu/RZo=' 
  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"
    }
  }
}