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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4fc5decc44251def550c7529aa07e8904a9bf2c68115966977171c38c42f3d' 
  AND token = 'Q16LnFVsdbDKduu8QszDe9rzr0heg6WMCk7aa0bUldg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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