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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd436799e1e0dd1f3d0376717098d5f77cd2c7746d04b2869519edb66b12a6a' 
  AND token = 'bY8aAfOJ7mY4Jg70OXs/4aK9nmhKAg9c2a+yvrqtvLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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