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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68de7e4cac2775d9706347fc39a553eff5a69a63e172085caae413c5b1ff2b4c' 
  AND token = 'nb4wsn1FijbexFYzSarijKW+1BL6ZAP4GnTYi5PmKoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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