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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57930a054c501390b4e9b40b95fb4b84db60e8702847f82bc62f50a402dcd3cf' 
  AND token = 'TSRjlSNtG9svb/uzila8d1t84GrM3TvK7O8yYy34Owc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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