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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccb5bd123071ff484b78fec79089c5c0cc8aef0a6d4701e3f08495838f72bd7' 
  AND token = '12mrk8b57Tmryfjg8THUyqlCW6Xy3VaDJhWRErRMJog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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