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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7175735aba883f901fc1445d066df65249398674e4f04529aa29d98c74e18b' 
  AND token = '80tiLUQau7GygbBZXaj5va5PchBuwm5mZVgu0j9Duxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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