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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2eff382eed43b1852a0a8163873667cb0213b5844f9458e4c44a7149574beaa' 
  AND token = 'egOA9ZcaqWpvzR/7lhWkK5q7tqnzOceGhMv5UMbL3Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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