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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a78f188318cb55419b2111db35dcd7ab738d9a81d7bb64567c6c76ca5aac0ef' 
  AND token = 'KMm28okyANosvoYKVn6zzy5ABv3Noix+fZ5pbrymIes=' 
  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"
    }
  }
}