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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfee9748d2bd17aa5324e2887d4eb04eac381a1a826dce4f2ca5991893ad93fa' 
  AND token = 'e1BwP2fPRLrGxh8FuZYSyF2vbRjixP3HtPz8AE7SL94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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