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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a378ff9f31fab33d60cdfe357f574ddfe90cb2fdbbb1788b02fe995d1c7098e' 
  AND token = 'dmsi7JcP1sXaHph1F0P/IydPLsDFL9AI4v9R2mUJ4u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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