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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7133c66d5751db8c9f29056efcc0356fe587e0cf7e67f82b6052a6fec25a2a8b' 
  AND token = 'Cb/OPF+5D/ng5aEe7K3TTcyWuxy0kp/XhkxZ0rPz1SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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