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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b59a8e4a08fade8b5ec24d72bab2ed659bfbf5fa534c393cddde7ca2bce709' 
  AND token = 'xTy5O0k8iggs06BEyIN8pwRgOLo1iWmyFMm7QJ/tKBs=' 
  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"
    }
  }
}