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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480a974b3cbe95e07d43d299c72e61be3be6250bc153477b3ea7e9b7913b5ad8' 
  AND token = 'CkjuFUAaewhd8nAUx3+z+sFMiLeCpRn3TuYOE5iIpa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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