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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcc3f801a2a7aac267abc4ee88bf4272fd8f4654f18b078226321619ce43c42' 
  AND token = 'GpZ8GWwT1TTy6J317BLRGtieLF8jY/9xSf1cmzk+Z1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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