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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d380000e431f5d3057df9c3c710dd237cf768d4609913522ee28fd954e69cb7' 
  AND token = '/VOCRl4pwms4FVAio/ECmaeu0Q3qgTlq57J2VFQxQ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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