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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f71e96f0a37e71a62253f7fb7412e9f935cd22cdee2b6d0a77ca62ff33d376' 
  AND token = 'Z3pz+rODZ1jXCHHfpn65ecW8vPgXhANjxlX5PwrdB+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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