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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d471b4658ef70b8aa0d245476834fdffbe31884f24ebbf5b447661e5111e1db' 
  AND token = 'fiNX/Ihh0sOFxKRdxQ3HtG8sc3bqo928qERQzMrC7/4=' 
  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"
    }
  }
}