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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcec2395da03a9fa2bacfef43e6f951666172600a9a06936fbd7f4912914f31' 
  AND token = 'cYghr6KuG/CjW/f+F11pbx1dexNOngolTDHOcsGLQvM=' 
  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"
    }
  }
}