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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e69ea0b4490c54fe60ff65f6a7fda3de625d0c8216380fa0f0f00c422e4159a' 
  AND token = '/fsXWwdrEGHG9yq9Of6zSVytkIp/uAPsns58uE4z+1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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