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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263ab6660c09b1567c90a2bf9996da26c0b0dcf755388ec7c5d903debd0d10a8' 
  AND token = 'JlDtWX6j6EM4PxreLJ674ZK56+YVEcZ/RNLR1LL/sr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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