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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f84b2583df5ae490c3904649984c9df49555d96f83a4863f854a5e2b2c0d082' 
  AND token = 'e6jU6KX6gMBVOwnZe7+dVUHmKRpiAet8I3BDz//164o=' 
  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"
    }
  }
}