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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee365dd60ae4f9fa9c7c76d87a46ba0a45b29ed75ad2c878c59264fd3db5d34' 
  AND token = 'PU2u8of49GIBKgXOPeapEnjjy1RZDRFkUybYGfUVDyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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