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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072c287226b62858a3195a2d9e31bb0ec7d41aae8956d66ce081d6ee23f03f8f' 
  AND token = '9r5s7E5lOsrkLNnNSubS64bMeGMmstIwsONFj67PVkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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