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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ed4640d3e5569c42909dcb8fd057b41ac095a4b0574b1fa6a5a365ad366a44' 
  AND token = 'roIkxI7ItcEaTBYRY5ca/CVV9U7KK4J5PaF8Dl27PB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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