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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77e8ec9f538b7c06ea3d5cbf0b1e9c94cc2029787b146401f59083624c56262' 
  AND token = '3pxQq+rJtfLnFUb4f/aChoCrnVNqDh6ojjT9Rsb6W1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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