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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b1bc6067ab6a62368c3b60f362ced722a876caaf4cb74a12fbff7371d8d807' 
  AND token = 'SA3lIs0NP1jHRjsb9WG7bMyIXL2Ikq0BN9WVwJKGvb4=' 
  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"
    }
  }
}