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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083f81f5f5f115b8656e2f714a14553ec035a487a00fb1466bb7a4b81a867eee' 
  AND token = 'YuynahJVdkwmIRHqXZt3ICuzHdhuxWycKELPrQ4Mc4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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