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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95b2284c99115d06c599536b668a48e27cc27f344405970d9a7bb6b9f7a3b30' 
  AND token = 'o3NJNgrJtRI5w4ojvtX9opIiUfKMJ7j/i0UzbMPFbjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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