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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7c1d0036336ca0655bd9e60f7248b2c0f3bb7659e0869e4d1114cffbde2020' 
  AND token = 'w+ZRol6BG8ROru6IbOfJJbvy3IAkBRkSDZN4CYVpASI=' 
  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"
    }
  }
}