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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7989b2257ba3e39d39541165ac19e38cca91c2827b81ae72ff0a79f10f502d34' 
  AND token = 'clvy5r+RL6Gh9sGu0x3VbmVC7MKdpzAyLkEUVrxS+fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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