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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ca81e3aabcbd7f407aea7a5e5a262d065300c3826235b6f5f0daf2d9b85e1f' 
  AND token = 'rarZKyufyiF3M8VQvON9BN7ltFSKVa2OJ5Mh4kymL3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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