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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d67acea942e111f7b60df55a601299c353f41fc5d22eeab161470fa317a6b9a' 
  AND token = 'XFAD9T+eGJ3G96GPT/5GeaMv/+UL2K8A2BQ/UjWHDfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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