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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ca674a62a834bb60ad7d964c698bdfff191c2fdffe463fdca12e917da94866' 
  AND token = 'cF8Bg3i/DqXHkXj3Wu89pUr1Z6PZWRioAZemLtA3eCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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