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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac7ca1f3410fb0fe7d3cbad7b2a4a3392373622b76a026aa47bb588a33efa33' 
  AND token = '/oRrrBLAKxkWuEvD6NsnTPRceomTNex0ry+LsIxA2YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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