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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10dbbba283f7a56f7332d7920f9a93585adf3e11936af695af4fadd4c100c13' 
  AND token = 'NP6+KuasSSh+rO1TK+CIgT5eUromrA5D0N5oESVRNCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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