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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913bde21dce86906b5cba6580256e0deda469071cbfeca5d16c63bc8d7628b43' 
  AND token = 'PKLyhaU3LCyw6hmiUAzDhQs2zV6ToZyos62DQ5hXcjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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