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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e2f096d8b95268b2be6c5e84ca6fdbd831f15b1060c3ea0889f3d69b7e6f73' 
  AND token = 'zKN6Z2oPW3vXmDePyRzArdwe/ZVWIKcA4ibU2ZVcU9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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