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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60926f652d7ea59b14cc6d4d05df4f955046ed63a14b4d19404869b5de6ca75' 
  AND token = '6LoGpx2rBrGpPy0+RDhq0GP1My3GXdLwGIsEs236Now=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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