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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3226faddd9fb0b43f8de9a3855ce40cc4335cdca60f68a1b99da0f374c556bff' 
  AND token = 'E02Y4e3ZgW7ECU0rDUfuZOs5R5UzFdlaGi/NqyoM4bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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