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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad8ba47f9084fbb1ff9a4f7bbca020cc39bcdc36c142243cfaeb9698fe91d96' 
  AND token = 'fp5jTstJKKF+AoyogSCAklt3J5M2iYt8+vwlCE0ZvSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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