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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e43f3f0b1f5f9a5ac63740f3708b9ee6e7a95bbab5f5760fa413f66b95f8fe' 
  AND token = 'ygcxV7he2z7r0EcMWaBMBHeL7rDkm3//XXsfsreHQLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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