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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7045066be96f6e2622ffbbab6f64d5ad2db2dd059a2341e16ce6260f23622964' 
  AND token = 'KrhEObwzINQLNdu198XLtlMnsw1d9s8sUi8p2DYNvfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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