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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c8eb70c4b9c250d2d8028e6c753ddc14d4e2efa9dd9cadca29a2d573745956' 
  AND token = 'RaTe4KXf+36s04PnTfDY/wNzHNytAfk3YN2LI+2krP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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