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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e874e97eeafd6e7300bcfd9bb9b466517aea1e4801b3a93d36a3a2ed2dc21a' 
  AND token = 'PIyE/0nr5rX/K6y9W1+JrYBxSXWJUrWahKC0Sti4Sv0=' 
  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"
    }
  }
}