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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be844df005b864e361a80698072827877c5574c7dbb5abdd6cd7e5e5e5fc662' 
  AND token = 'FA5ZkZTl7bgRgXcq2sm90Jmfc+aSX5nil/X0UvYLO/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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