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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25784d5c83e85f08e26594155848ea9ac22c3347dc85e4b46a47cdcdad6b690a' 
  AND token = 'diFZJQH3hlS5WpL7RB/VXdZQ+dM8uPyFc6X45NNxMWw=' 
  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"
    }
  }
}