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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eba0be3904331cf4b8daad2964123ec3e37563b3a559a0844ce70e7c9cee5cc' 
  AND token = 'qIpqsiVfyI9H95uZIuNf8Qsc/DSTrLutNYVKwCbjvl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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