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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb990df5bfb618bcdfbe8b28f9011b988aae734a9fc51ebd53220ae53854fb77' 
  AND token = 'FoHjBf5hk0YAIs/vm44NeFCe8vhGdBwTukV3mclLeB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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