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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ba333f2d07187b6441cb363f93ed9cc00705bf6ee45e9407630dbc97db76bc' 
  AND token = 'fuofiVb25H7U5X9GHy+magV5Aarvyi3+fW8pc2zVM5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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