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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f508ed45aef3819d3404060b019cf2180eb79fefe8105cb4bea26d9492d9e18e' 
  AND token = 'ZwhAETNovi+RAddYUiGd1/RBGrkdDrPR8c2lAIh7fYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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