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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076053bd10c6a318833f3221d39732e713bee7652c7582429c067f70b9b247f0' 
  AND token = 'dhx6CCrF+WMg6FVLRrYXor+TiFmiNP5rpQtGSzDDTcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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