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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9638628b3103a2b21e7a430d5314a3733ea607e3e9a67b17995e30bde79d76fc' 
  AND token = 'EY+78SxnPBSeTdGv97g0UFKipp50nYCKMTlhWA8y+/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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