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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4e8fb5ff9a0db812b347ef83d1d9d3652f6da8729d1f2db250bd54a66ecb13' 
  AND token = 'xsffnQaqInJarZR15IcyoYD9cwT6fzDwueGpts/BD1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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