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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9411c0979d8e996e4e0bb0f5c1e452b5503753f26b60605ebf65cbca8bfb46a7' 
  AND token = 'eR4QVz6znbIlPIFm/jWzuTx+8dY0V6sTvzTsE/ckL+U=' 
  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"
    }
  }
}