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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bcb6f32ac1d5d68f39d8d26c3779740e07de709fa8f09631b355ba7e09de07' 
  AND token = '+yyZpzLAKvddnEuDKWzNQXWgukom5ax7rEywcx1bvu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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