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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19c096531bd71a16c6f2182ae274522feb6a62311bc732c083b5c8e8a478ef3' 
  AND token = 'DQ82kWHpeqVH9+68G9mBx0lGe0Hiur8+dbA1ToOm1ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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