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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae7aa6e7797fa56c6bb2ecf432de88db0802ee2e14f29c26911b5a9a95103ac' 
  AND token = '35mVKZQn0FoN7BGqSxS9LMrB2y5CtOiLYL/RHQhLuEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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